Magneto-frame



W. E. DOW. MAGNETO FRAME.

APPLICATION HLED AUG.21. 1913.

1,195,921. Patented Aug. 22, 1916.

' rately WILLARD E. DOW, OF BRAINTREE, MASSACHUSETTS,

MAGNETO-FRAME.

Application filed August 21, 1913.

1 b all whom it may concern.

Be it known that l, VVILLAnn E. Dow, a citizen of the United States, and resident of Braintree, county of Norfolk, Commonwealth of Massachusetts, have invented an Improvement in l\.lagneto-l*rames, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

The present invention relates to bodies or frames for magnetos such as used for ignition systems of internal combustion engines and the like.

The invention consists in an improved construction of body of this kind wherein an integral unit which may be produced by a single casting is fashioned and arranged to hold in rigid and secure assemblage all the operative parts of the magneto, including the field magnets, the armature, the distributer, the interrupter, etc., Which for their proper respective collocation in the machine only require to be fixed to this one-piece body by any usual securing means. In accordance with my invention not only are all. these operative parts held securely and accuassembled by this one-piece body, the parts of which interbrace one another, but this one-piece, integral unit construction of the body, including inclosing housing portions for the projecting operative parts makes a much more completely moisture proof device than has hitherto been produced. Further, since the entire supporting and housing frame is cast at a single operation, the expense of production is very materially lessened not only as to the casting, but also in the eliminating of the assemblage of the parts which have hitherto made up the magneto frame. I also preferably it in, the pole shoes pieces of the field magnets at the sides of my improved frame, in a manner so that the relatively soft metal which composes the frame casting is adapted to shrink around and tightly hold the shoe pieces without any separate fastening means therefor.

The above and other objects and features of the invention will be better understood from the following detailed description taken in connection with the accompanying drawings and will be thereafter pointed out in the appended claims;

Referring to the drawings: Figure 1 is a perspective View of a magneto frame constructed in accordance, with my invention;

Specification of Letters Patent.

Patented Au". 22, 1.)16.

Serial No. 785,959.

Fig. 2 is an endview thereof; Fig. 3 is a side elevation; and Fig. 4 a trai'isverse section on line -l-t of Fig. 3.

My improved frame bronze or like non-magnetic metal and the illustrative form select d for the present showing consists in a generally rectangular oblong block 10 having its sides somewhat tapering as at 11, the major portion of these sides being recessed as at 12 to form seats for the ends of the U-shaped permanent field is preferably cast of magnets m which constitute the magnetic field. This block is longitudinally bored as at 13 to receive the armature which is journaled in suitable ball bearings fitted in the ends of the frame, one of these ends having a reduced projecting sleeve 1i especially for this purpose, and the other or distributor end of the frame having the full size of the armature bore carried to its extremity as at 15, the armature bearings at this end along with the interrupter mechanism being suit ably mounted in this end of the bore. ''1 he pole shoes, usually of cast iron as indicated at 16, are positioned at the sides of the block, being held in the casting by the shrinkage of the surrounding metal and their outer sides constitute the major portions of the bottoms of the magnet seats 12 so that the magnet extremities are contiguous thereto while their inner sides open into the bore of the frame and are shaped to conform thereto as seen at 17. As a means for mounting the distributer mechanism I form at the interrupter end of the frame an upwardly projecting face portion 18 with a bearing sleeve 18 projecting from the back thereof and. also having an integral connection with the top of the frame block proper, this face portion and bearing sleeve being provided with 4 a bearing bore 19 for the distributer gear, the face portion having a forwardly projecting shroud flange 20 which constitutes part of a housing for the distributor mechanism, this shroud housing being extended down and containing the end of the bore 15 as indicated at 2 1. It is to be observed that this shroud flange or housing thus in egrally formed with the base portion of the frame block, and projecting up integrally with the face portion 18 which also rises integrally from .the frame block, makes a particularly rigid and reliably inter-braced mounting and support, adapted to hold the working parts accurately and in precise alinement without possibility of even the slightest dislocation.- as well as protecting the vital parts of the mechanism, viz: the distributer and interrupter from moisture or Wet of any kind. It is to be further noted that my improved construction including the magneto body with the integral sleeve 18 formed on the top thereof in conjunction with the integral shroud flange 20 provides a one piece construction wherein the several portions mutually strengthen and interbrace one another so that a maximum of rigidity with a minimum of material is possible, along with the before mentioned advantage of insuring freedom from ingress of moisture. It will be understood that in this combination of elements, the formation of the shroud flange 20 at the face of'the body is of value and importance since it thus combines the functions of a protecting housing for the distributer and interrupting gearing and as a stiffening and strengthening flange for the di'stributer bearing. At the other end of the stand is formed a cylindrical extension 22 for the slide ring, the before mentioned reduced bearing sleeve 14 projecting integrally from this extension. A short threaded collar 23 projects up from the top of extension 22 having a boreadapted to receive the carbon brush holder which may be formed with threads to engage the threads of this collar. Thus this end of the device is also protected to the highest possible degree against the entrance of moisture and the integral formation contributes to the strength and rigidity of the entire unit as well as greatly reducing the cost that would be involved in producing the several parts separately and machining them so that they would fit together accurately as required.

It is to be observed that the sleeve 14 has its outer face extended in to fit closely around the armature shaft as indicated at 24: so as to better serve as a housing protector.

The operative parts that are supported and heldassembled by my improved frame are indicated in outline in dotted lines so as to make the structure of the frame itself appear more clearly and as these operative parts form no part of the present, invention. The field magnets are indicated at m, the arma ure shaft at s, an outline of the in-' tel-rupter at 2', this being housed in the bore exten ion 15. and a block or plate being indicated at rt which carries and affords an outer bearing for the distributer and is suitably fixed to ,the outer edge or face of-the flange 20. It will be understood that the specific form and character of these parts is not material to the present invention, the only essential being an adaptability for assemblage to be held in cooperative relation on the frame set forth.

My improved frame thus formed as an integral uni-t can be made of the requisite strength and rigidity while considerably lighter than a built-up frame, since the sevcral parts of'the integral formation are so arranged and disposed as to mutually brace and stiffen one another and thus expense is largely reduced in labor as well as cost of material, with the further accruing advatage of an integral frame that is alsoso far as possible a completely tight housing for the working parts to protect the same from moisture.

I do not desire to be limited to the precise embodiment of the invention herein shown and refer to the appended claims rather than to the foregoing description to indicate the scope thereof.

Having described my invention, what if claim as new and desire to secure by Letters Patent is:

l. A magneto frame, formed as an integral unit with a longitudinal armature receiving bore and lateral recessed seats for the field magnets, there being pole shoes held by the surrounding metal to fill the space between the bottoms of said seats and said bore, and said frame being equipped with extensions at its ends integral therewith, one of said extensions having an up wardly projecting sleeve to hold the hearing for a distributer mechanism, there being an upwardly extending shroud integral with the body of said frame and also with said sleeve to serve as a housing for the interrupter and distributor gearing, whereby it and the sleeve are mutually interbraced, and the extension at the other end being equipped to serve as a mounting and housing for the armature shaft, the slide ring and the carbon brush. 4

2. A magneto frame formed as an inte gr: unit with a bore for the armature and provision for fixing a field. magnet in proximity thereto, said frame having an integral upward and forward extension affording a bearing and housing for the dis tributer and interrupter mechanism, and having also formed in one piece therewith a rearward extension equipped to serve as 'a mounting and housing for the armature shaft, the slide rings and the carbon brush, said rearward extension constituting a com plete-closure for the rear end of the armature bore with a passage through which the armature shaft is fitted.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

WILLARD E. DOlV.

vlfitnesses Cannorra N] x, Brennan G. Moonr. 

